Table 3.4 SPS Cell and Planform Power Characteristics The end-mounted microwave antenna is a phased-array transmitter of 1-km diameter. The phase control system utilizes an active, retrodirective array with a pilot beam reference for phase conjugation. Klystrons are used as the baseline power amplifier with slotted waveguides as the radiating element. The ground rectenna has subarray panels with an active element area of 78.5 km^. At 35° latitude, the total rectenna area, including the buffer zone, would be 149 km^. The construction of the satellite in geosynchronous orbit (GEO) is estimated to require six months. The initial estimates of construction crew size are 555 for the silicon option [480 in GEO and 75 in low earth orbit (LEO)] and 715 for the GaAlAs option (680 in GEO and 35 in LEO). The transportation system assumed for the NASA contractor reference system consists of four major components: the heavy-lift launch vehicle (HLLV), the cargo orbit-transfer vehicle (COTV), the personnel launch vehicle (PLV), and the personnel orbit-transfer vehicle (POTV). The HLLV is a two- stage, vertical launch, winged, horizontal landing, reusable vehicle with a 424-metric ton payload to low earth orbit. The Kennedy Space Center was chosen as the reference earth launch site. The COTV is an independent, reusable, electric engine-powered vehicle, which transports cargo from the HLLV delivery site in low earth orbit to the geosynchronous earth orbit. For the GaAlAs option, the COTV is powered by GaAlAs solar cells, whereas a silicon solar cell power supply is assumed for the silicon option. Personnel for the orbital construction and support functions are transported to LEO by the PLV, which is a modified space shuttle orbiter with a passenger module. The POTV, a two-stage, reusable, chemical-fuel vehicle, is used to transfer personnel from LEO to GEO and vice versa. Additionally, a LEO operations base would be constructed and used for temporary storage of supplies and propellant.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==